Trematosphindus kirejtshuki, Legalov & Vasilenko & Perkovsky, 2024

Legalov, Andrei A., Vasilenko, Dmitry V. & Perkovsky, Evgeny E., 2024, A new species of the genus Trematosphindus Li et Cai, 2021 (Coleoptera: Sphindidae) from Cenomanian Taimyr amber, Ecologica Montenegrina 71, pp. 165-171 : 166-168

Trematosphindus kirejtshuki sp. n. ( Figs. 1-3 )

https://zoobank.org/ urn:lsid:zoobank.org:act:AC889191-A6B0-4EDF-A99F-4ED65F1F4F67

Type material: PIN no. 3426/258, Nizhnyaya Agapa , Taymyrsky Dolgano-Nenetsky District, Krasnoyarskii Krai, Russia, Cenomanian .

Description. Body brownish, covered with sparse setae. Head without distinct grooves. Mandibles large. Eyes large, convex, finely faceted. Frons flattened. Antennae 11-segmented. First and second antennomeres suboval. First antennomere 2.0 times as long as wide in middle. Second antennomere 1.6 times as long as wide in middle, 0.6 times as long as and 0.8 times as narrow as first antennomere. Third–fourth antennomeres long-conical. Third antennomere about 2.9 times as long as wide at apex, subequal in length and about 0.5 as narrow as second antennomere. Fourth antennomere about 1.8 times as long as wide at apex, about 0.7 times as long as and slightly wider than third antennomere. Fifth–sixth antennomeres conical. Fifth antennomere 1.5 times as long as wide at apex, subequal in length and about 1.2 times as wide as fourth antennomere. Sixth antennomere about 0.9 times as long as wide at apex, about 0.7 times as long as and about 1.3 times as wide as fifth antennomere. Seventh and eighth antennomeres wide-conical. Seventh antennomere slightly longer than width at apex, about 1.2 times as long as and subequal in width to sixth antennomere. Eighth antennomere about 0.7 times as long as wide at apex, subequal in length and about 1.5 times as wide as seventh antennomere. Antennal club distinct, consists of ninth–eleventh antennomeres, shorter than antennomeres 2-7 combined. Ninth antennomere about 0.7 times as long as wide at apex, about 1.7 times as long as and about 1.8 times as wide as eighth antennomere. Tenth antennomere about 0.5 times as long as wide at apex, about 0.9 times as long as and about 1.1 times as wide as ninth antennomere. Eleventh antennomere subequal in length and width in middle, about 1.6 times as long as and about 0.9 times as narrow as tenth antennomere. Pronotum campanulate, subequal to wide at apex, about 0.7 times as long as wide in middle and at base, without large cavities at anterior pronotal angles. Maximum width before base. Disk convex, coarsely punctate. Distances between punctures are much smaller than punctures. Sides rounded. Pronotal lateral edges dentate by quite blunt teeth. Precoxal portion of prosternum elongate, about 1.9 times as long as precoxal cavity length. Postcoxal portion of prosternum short, about 0.6 times as long as precoxal cavity length and about 0.3 times as long as precoxal portion. Distance between procoxae about 0.6 times as narrow as procoxal cavity width. Procoxal cavities closed externally. Tarsi five-segmented. Length of head: 0.7 mm; length of pronotum: 0.8 mm.

Type strata. Dolgan Formation.

Differential diagnosis. The new species differs from Trematosphindus newtoni Li et Cai, 2021 in the pronotum without large cavities at anterior pronotal angles, more blunt teeth on the sides of the pronotum, and finely faceted eyes.

Etymology. Patronymic. In honour of Dr. Alexander G. Kirejtshuk (Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia), who studied fossil Sphindidae .

Localisation. Russia: Krasnoyarskii Krai: Taymyrsky Dolgano-Nenetsky District.

Remarks. The species is placed in the genus Trematosphindus Li et Cai, 2021 because of an antennal club consists of three antennomeres, a head without distinct grooves, 11-segmented antennae, dentate lateral edges of the pronotum, and closed externally procoxal cavities.

Figures

Figure 1. Trematosphindus kirejtshuki sp. n., PIN 3426/258, head and prosternum, lateral view, Taimyr amber.

Figure 2. Trematosphindus kirejtshuki sp. n., PIN 3426/258, head and prosternum, ventral view, Taimyr amber.

Figure 3. Trematosphindus kirejtshuki sp. n., PIN 3426/258, head and pronotum, dorsal view, Taimyr amber.